PDF malware analysis — malicious · 3ee7cc14b2dd2b28

MALICIOUS

PDF

43.2 KB

MD5: f8b8d7108412251882a21c3326b73e48 SHA-1: 588cb79f4ae011fed4ad1fa8bc78f2d6f4e2b198 SHA-256: 3ee7cc14b2dd2b2855d68a1f8293aaa23460f4b7a3feb162492b6758192178ac

108 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript T1566.002 Phishing: Spearphishing Attachment

This PDF document contains embedded JavaScript, flagged by multiple heuristics including a critical alert for CVE-2009-4324. The ML classifier also strongly indicated maliciousness. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', is likely responsible for executing the exploit and downloading a secondary payload, though its exact function is obscured. The presence of the CVE-2009-4324 exploit and the embedded script points to a malicious PDF designed for exploitation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `98e95aa7845dabbca6328c75b4cd7f2d4b6d80f4e2b60854cd43a725e8fc56ef`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	2221 bytes
`legacy_pdfkit_stage_000.js` `e25eb9dea927fc4a67324232040e7bccd1874be12a367fce24d0ca6ae7a3286e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xAC8	2744 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414`	deobfuscated-js	cross-stage annotation API aliases at offset 0x1E7	81 bytes

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